Timing and petrogenesis of multiple porphyritic intrusions in the Gumushane-Kiziltoprak Tepe prospect, NE Turkiye: implications for early Cenozoic post-subduction magmatism and metallogeny of the Eastern Sakarya Zone
INTERNATIONAL GEOLOGY REVIEW, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Basım Tarihi: 2026
- Doi Numarası: 10.1080/00206814.2026.2671160
- Dergi Adı: INTERNATIONAL GEOLOGY REVIEW
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Geobase, Academic Search Ultimate (EBSCO), Natural Science Collection (ProQuest), Earth, Atmospheric, & Aquatic Science Collection (ProQuest)
- Karadeniz Teknik Üniversitesi Adresli: Evet
Özet
This study presents new zircon U-Pb and molybdenite Re-Os geochronology, whole-rock geochemistry, Sr-Nd isotopes, and zircon Hf-isotope data from Eocene porphyritic intrusions at Kiziltoprak Tepe prospect in the Eastern Sakarya Zone (ESZ), NE Turkiye, to constrain the tectonomagmatic and metallogenic evolution of the ESZ. Field, drill-core, and petrographic observations define three intrusive stages: (i) pre-mineralization (barren) amphibole-bearing quartz diorite porphyries, (ii) syn-mineralization (mineralized) amphibole +/- clinopyroxene +/- biotite-bearing dioritic-andesitic to dacitic-rhyolitic porphyries, and (iii) post-mineralization plagioclase-phyric andesitic dikes. Zircon U-Pb ages indicate emplacement of barren porphyries at similar to 47 Ma and mineralized porphyries at similar to 45-40 Ma, whereas molybdenite Re-Os ages of similar to 43 and similar to 26 Ma record multi-stage hydrothermal mineralization. Geochemical and isotopic data indicate medium- to high-K calc-alkaline, metaluminous magmas derived from hybrid mantle-crust sources. Barren porphyries reflect stronger crustal contributions, whereas mineralized porphyries record increased juvenile mantle input, interpreted as enhanced magma recharge and mixing within a long-lived magmatic system favourable for ore formation. Elevated La/Yb, Gd/Yb, and Sm/Yb ratios support slab break-off of the northern Neotethyan lithosphere. These results highlight the critical role of magma evolution and source mixing in controlling porphyry-epithermal fertility and provide new constraints on early Cenozoic metallogenesis in the ESZ.